ETagUtil.java |
1 /** 2 * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a copy 5 * of this software and associated documentation files (the "Software"), to deal 6 * in the Software without restriction, including without limitation the rights 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 8 * copies of the Software, and to permit persons to whom the Software is 9 * furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 20 * SOFTWARE. 21 */ 22 23 package com.liferay.portal.servlet.filters.etag; 24 25 import com.liferay.portal.kernel.servlet.HttpHeaders; 26 import com.liferay.portal.kernel.util.GetterUtil; 27 import com.liferay.portal.util.PropsUtil; 28 29 import java.util.Arrays; 30 31 import javax.servlet.http.HttpServletRequest; 32 import javax.servlet.http.HttpServletResponse; 33 34 /** 35 * <a href="ETagUtil.java.html"><b><i>View Source</i></b></a> 36 * 37 * @author Brian Wing Shun Chan 38 */ 39 public class ETagUtil { 40 41 public static boolean processETag( 42 HttpServletRequest request, HttpServletResponse response, 43 byte[] bytes) { 44 45 if (!_ETAG_FILTER_ENABLED) { 46 return false; 47 } 48 49 String eTag = Integer.toHexString(Arrays.hashCode(bytes)); 50 51 response.setHeader(HttpHeaders.ETAG, eTag); 52 53 String ifNoneMatch = request.getHeader(HttpHeaders.IF_NONE_MATCH); 54 55 if (eTag.equals(ifNoneMatch)) { 56 response.setStatus(HttpServletResponse.SC_NOT_MODIFIED); 57 response.setContentLength(0); 58 59 return true; 60 } 61 else { 62 return false; 63 } 64 } 65 66 public static boolean processETag( 67 HttpServletRequest request, HttpServletResponse response, String s) { 68 69 return processETag(request, response, s.getBytes()); 70 } 71 72 private static final boolean _ETAG_FILTER_ENABLED = GetterUtil.getBoolean( 73 PropsUtil.get(ETagFilter.class.getName()), true); 74 75 }